CN108616818B - Data retransmission method, bluetooth slave device and wireless communication system - Google Patents
Data retransmission method, bluetooth slave device and wireless communication system Download PDFInfo
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- CN108616818B CN108616818B CN201810246718.7A CN201810246718A CN108616818B CN 108616818 B CN108616818 B CN 108616818B CN 201810246718 A CN201810246718 A CN 201810246718A CN 108616818 B CN108616818 B CN 108616818B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention provides a data retransmission method, which comprises the following steps: receiving broadcast data sent by a Bluetooth master device at a preset receiving interval; detecting whether broadcast data sent by the Bluetooth master device is correctly received; and when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data. The embodiment of the invention also provides the Bluetooth slave device and a wireless communication system. The invention adds the function of feeding back incorrect information received by Bluetooth slave equipment after receiving broadcast data on the basis of the existing point-to-multipoint broadcast transmission mechanism. By utilizing the characteristic that a plurality of Bluetooth slave devices adopt the same synchronous words to simultaneously transmit on the same channel, whether the Bluetooth slave devices require data retransmission or not is judged according to the relation between the Bluetooth master device and feedback data, thereby realizing automatic retransmission to improve the reliability of point-to-multipoint broadcast transmission.
Description
Technical Field
The present invention relates to the field of bluetooth wireless communication, and in particular, to a data retransmission method, a bluetooth slave device, and a wireless communication system.
Background
The wide development of bluetooth technology makes bluetooth products become a part of people's life, especially uses bluetooth headset and bluetooth speaker of smart mobile phone as central node to bring very big convenience for people. Bluetooth is mainly a point-to-point communication technology, and such network topology limits bluetooth to meet more and more extensive demands. For this purpose, the bluetooth standard adds a connectionless slave device broadcast technology (CSB: connectionless Slave Broadcast), i.e., a bluetooth low energy (BLE: bluetooth Low Energy) synchronous channel broadcast technology (BIS: broadcast Isochronous Stream) is added to the future standard, to implement point-to-multipoint data transmission. I.e. one bluetooth device acts as a bluetooth master device capable of transmitting broadcast data to a plurality of bluetooth slave devices. However, in the practical application process, in an increasingly severe interference environment, the CSB/BIS has difficulty in ensuring the reliability of data transmission.
Disclosure of Invention
In view of this, it is desirable to provide a data retransmission method, a bluetooth slave device, and a wireless communication system, which improve reliability of point-to-multipoint broadcast transmission by means of data retransmission.
In order to achieve the above object, the technical solution of the embodiment of the present invention is as follows:
an embodiment of the present invention provides a data retransmission method, where the method includes:
receiving broadcast data sent by a Bluetooth master device at a preset receiving interval;
detecting whether broadcast data sent by the Bluetooth master device is correctly received;
and when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data.
The second aspect of the embodiment of the invention provides a Bluetooth slave device, which comprises a data receiving and transmitting module and a processor;
the data receiving and transmitting module is used for receiving broadcast data sent by the Bluetooth main equipment at preset receiving intervals;
the processor is configured with processor-executable operating instructions to perform operations comprising:
detecting whether broadcast data sent by the Bluetooth master device is correctly received;
and when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data.
A third aspect of an embodiment of the present invention provides a wireless communication system including:
the Bluetooth master device is used for sending broadcast data to the Bluetooth slave device in a sending time slot at preset sending intervals, and retransmitting the broadcast data corresponding to the acknowledgement packet to the Bluetooth slave device when receiving the acknowledgement packet sent by the Bluetooth slave device; the confirmation packet is a signal generated by the fact that the Bluetooth slave device does not correctly receive the transmitted broadcast data and requests retransmission of the broadcast data;
and, according to a third aspect of the embodiment of the present invention, a bluetooth slave device.
The beneficial effects of the invention are as follows: the invention provides a data retransmission method for point-to-multipoint broadcast transmission, which is added with the function of feeding back incorrect information received by Bluetooth slave equipment after receiving broadcast data on the basis of the existing point-to-multipoint broadcast transmission mechanism. By utilizing the characteristic that a plurality of Bluetooth slave devices adopt the same synchronous words to simultaneously transmit on the same channel, whether the Bluetooth slave devices require data retransmission or not is judged according to the relation between the Bluetooth master device and feedback data, thereby realizing automatic retransmission to improve the reliability of point-to-multipoint broadcast transmission.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a flowchart of a data retransmission method according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a data retransmission method according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram of a slot structure of a CSB according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a bluetooth slave device according to embodiment 3 of the present invention;
fig. 5 is a flowchart of the operation of the bluetooth slave device according to embodiment 3 of the present invention;
fig. 6 is a schematic diagram of a bluetooth master device according to embodiment 4 of the present invention;
fig. 7 is a flowchart of the operation of the bluetooth master device according to embodiment 4 of the present invention;
fig. 8 is a schematic diagram of a wireless communication system according to embodiment 5 of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of exemplary embodiments of the present invention is provided in conjunction with the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention and not exhaustive of all embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The data retransmission method, bluetooth slave device and wireless communication system of the present invention can be practically applied to any point-to-multipoint wireless transmission scenario, and for the convenience of understanding of those skilled in the art, the following embodiments are described by taking the connectionless slave device broadcast technology (CSB: connectionless Slave Broadcast) as an example, but are not limited to the CSB scenario.
Example 1
As shown in fig. 1, this embodiment proposes a data retransmission method, which includes:
s101, receiving broadcast data sent by a Bluetooth master device at preset receiving intervals;
s102, detecting whether broadcast data sent by the Bluetooth master device is correctly received;
and S103, when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data.
The data retransmission method described in this embodiment is applied to a bluetooth slave device, and may also be referred to as a CSB slave device. The embodiment adds a data feedback mechanism in the CSB slave device, that is to say, the CSB slave device itself determines whether the bluetooth master device (i.e. the CSB master device) needs to retransmit the broadcast data. To achieve this, first, the CSB slave device receives CSB data transmitted by the CSB master device in a reception slot at a preset reception interval, then determines whether to correctly receive the CSB data, and determines whether to request the CSB master device to retransmit the CSB data according to the determination result.
Specifically, after the CSB data is received, it is necessary to determine whether the CSB data is correctly received. The judgment is performed in order of sync word detection, packet header detection, and cyclic redundancy detection (CRC: cyclic Redundancy Check). For example, when the received CSB data passes through the sync word detection, the packet header detection and the cyclic redundancy detection, the CSB slave device correctly receives the CSB data, and the CSB master device does not need to retransmit the data, so that the data transmission in the current receiving interval is finished; and when the synchronous words of the broadcast data are not matched, the packet head is received in error or the cyclic redundancy detection is not passed, the CSB slave device is not used for correctly receiving the CSB data, and then the CSB slave device can send an acknowledgement packet to the CSB master device in a sending time slot to request the CSB master device to retransmit the data. And then, the CSB slave device receives the retransmission data sent by the CSB master device again until the number of times that the CSB slave device receives the broadcast data retransmitted by the CSB master device is equal to the preset retransmission number or the number of times that the CSB slave device receives the broadcast data is understood to be zero, and the receiving is ended.
Example 2
As shown in fig. 2, this embodiment proposes a data retransmission method, which includes:
s201, broadcasting data is sent to Bluetooth slave equipment in a sending time slot at preset sending intervals;
s202, receiving a confirmation packet sent by Bluetooth slave equipment, wherein the confirmation packet comprises a synchronous word;
s203, detecting the confirmation packet to obtain a signal intensity value and a synchronous word normalization correlation value;
s204, determining retransmission broadcast data according to the signal intensity value and the synchronous word normalization correlation value.
The data retransmission method described in this embodiment is applied to a bluetooth master device, and may also be a CSB master device. First, the CSB master device transmits broadcast data to the CSB slave device in a transmission slot at a preset transmission interval, and the CSB slave device may feed back whether retransmission is required according to the procedure described in embodiment 1. After the CSB master device receives the retransmission request sent by the CSB slave device, judging whether the CSB master device really receives the retransmission request or not, and carrying out the data retransmission process according to the judging result.
Specifically, the core point in the data retransmission method described in this embodiment is how to continuously determine whether retransmission is needed in the CSB master device. In the method described in this embodiment, the signal strength value and the synchronization word normalization correlation value are obtained by detecting the acknowledgement packet sent by the CSB slave device. Only when the signal strength value and the normalized correlation value of the synchronous word are larger than the preset respective threshold values, the retransmission request sent by a certain CSB slave device is determined to be received, the subsequent retransmission process is carried out, and otherwise, the data transmission in the current transmission interval is directly ended. In addition, when the number of times of retransmitting the broadcast data to the CSB slave device is equal to the preset number of retransmissions, the retransmission of the broadcast data to the CSB slave device is stopped.
The transmission slots and the reception slots of the CSB master and the CSB slave described in embodiments 1 and 2 are both corresponding, that is to say the transmission slots of the CSB master correspond to the reception slots of the CSB slave and vice versa. To facilitate understanding of the slot structure of the CSB of the present invention, fig. 3 shows one slot of the CSB in an embodiment of the present application. As shown in fig. 3, the long data packet with a solid line is a broadcast packet transmitted by the CSB master device according to the bluetooth CSB protocol, that is, CSB data, and the CSB transmission interval is "CSB transmission interval" shown in the figure. The CSB slave receives CSB data in the transmit slot of the CSB master, in other words the CSB slave receives CSB data in its own receive slot. Wherein the dashed small box represents an acknowledgement packet sent by the CSB slave device in the transmit slot. The dashed large box represents CSB data retransmitted by the CSB master. The retransmission time corresponding to the retransmission times does not exceed the CSB transmission interval. The acknowledgement packet according to this embodiment includes a preamble and a synchronization word, where the synchronization word is generated according to the bluetooth address of the CSB master device, that is, the synchronization word of the acknowledgement packet sent by the CSB slave device is identical to the synchronization word of the CSB data packet sent by the CSB master device. In classical bluetooth, the synchronization word is an access code; in bluetooth low energy, the synchronization word is the access address. Therefore, the content included in the acknowledgement packet is different according to the actual application scenario, but the essence is the same.
Since all the CSB slave devices almost synchronously transmit identical acknowledgement packets, and the synchronization words of the acknowledgement packets have good auto-correlation and cross-correlation properties, the acknowledgement packets transmitted by the CSB slave devices do not interfere with each other, that is, the CSB master device does not influence whether the acknowledgement packets exist. Due to signal fading and distance factors, the acknowledgement packet intensities fed back by the plurality of CSB slave devices are different, and the acknowledgement packet of some CSB slave devices may be covered by the acknowledgement packet of other CSB slave devices, however, the CSB master device can automatically retransmit CSB data to the CSB slave devices feeding back the acknowledgement packet as long as the CSB master device can detect that the strongest acknowledgement packet exists.
Example 3
As shown in fig. 4, the present embodiment proposes a bluetooth slave device, where the bluetooth slave device includes a data transceiver module and a processor;
the data receiving and transmitting module is used for receiving broadcast data sent by the Bluetooth main equipment at preset receiving intervals;
the processor is configured with processor-executable operating instructions to perform operations comprising:
detecting whether broadcast data sent by the Bluetooth master device is correctly received;
and when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data.
Specifically, the bluetooth slave device in this embodiment is a CSB slave device, and in this embodiment, a data feedback mechanism is added to the CSB slave device, that is, the CSB slave device itself determines whether the bluetooth master device (i.e., the CSB master device) needs to retransmit the broadcast data. To achieve this, first, the CSB slave device receives CSB data transmitted by the CSB master device in a reception slot at a preset reception interval, then determines whether to correctly receive the CSB data, and determines whether to request the CSB master device to retransmit the CSB data according to the determination result.
Specifically, as shown in fig. 5, after the CSB data is received, it is necessary to determine whether the CSB data is correctly received. The judgment is performed in order of sync word detection, packet header detection, and cyclic redundancy detection (CRC: cyclic Redundancy Check). For example, when the received CSB data passes through the sync word detection, the packet header detection and the cyclic redundancy detection, the CSB slave device correctly receives the CSB data, and the CSB master device does not need to retransmit the data, so that the data transmission in the current receiving interval is finished; and when the synchronous words of the broadcast data are not matched, the packet head is received in error or the cyclic redundancy detection is not passed, the CSB slave device is not used for correctly receiving the CSB data, and then the CSB slave device can send an acknowledgement packet to the CSB master device in a sending time slot to request the CSB master device to retransmit the data. And then, the CSB slave device receives the retransmission data sent by the CSB master device again until the number of times that the CSB slave device receives the broadcast data retransmitted by the CSB master device is equal to the preset retransmission number or the number of times that the CSB slave device receives the broadcast data is understood to be zero, and the receiving is ended.
Example 4
As shown in fig. 6, the present embodiment proposes a bluetooth master device, which includes an antenna, a radio frequency transceiver, a baseband processor, an acknowledgement packet detector, and a bluetooth protocol processor;
the radio frequency transceiver is used for modulating a baseband signal sent by the baseband processor into a radio frequency signal and sending the radio frequency signal to the Bluetooth slave device through the antenna, receiving a confirmation packet sent by the Bluetooth slave device and received by the antenna, and sending the confirmation packet to the confirmation packet detector, wherein the confirmation packet is a data packet generated by the Bluetooth slave device when the Bluetooth slave device does not correctly receive the sent broadcast data and requests retransmission of the broadcast data;
the baseband processor is used for processing and converting the broadcast data sent by the Bluetooth protocol processor and the acknowledgement packet sent by the radio frequency transceiver into baseband signals;
the acknowledgement packet detector is configured to receive an acknowledgement packet converted into a baseband signal sent by the radio frequency transceiver, and detect the acknowledgement packet;
the Bluetooth protocol processor is used for configuring a channel, a transmitting time slot and a receiving time slot of the radio frequency transceiver, and retransmitting broadcast data corresponding to the acknowledgement packet to the Bluetooth slave device according to the detection result sent by the acknowledgement packet detector.
The bluetooth master device in this embodiment is a CSB master device. In the CSB master device transmitting time slot, the Bluetooth protocol processor configures parameters such as channel and time slot of the radio frequency transceiver, and transmits the transmitting data to the baseband processor for processing, then the transmitting channel of the radio frequency transceiver is modulated into radio frequency signals, and finally the radio frequency signals are transmitted to the CSB slave device through the antenna. In the receiving time slot, parameters such as a channel, a time slot and the like are configured through a Bluetooth protocol processor, a wireless signal is converted into a baseband signal through a receiving channel of a radio frequency transceiver after being received from an antenna, and the baseband signal is directly sent to a confirmation packet detector for processing. And sending the detection result of the confirmation packet detector to the Bluetooth protocol processor to judge whether retransmission is needed.
As shown in fig. 7, the CSB master device transmits broadcast data to the CSB slave device in a transmission slot at a preset transmission interval, and the CSB slave device may perform feedback on whether retransmission is required according to the procedure described in embodiment 1 or embodiment 3. After the CSB master device receives the retransmission request sent by the CSB slave device, judging whether the CSB master device really receives the retransmission request or not, and carrying out the data retransmission process according to the judging result.
Specifically, the core point of this embodiment is how to continue to determine whether retransmission is needed in the CSB master device. In this embodiment, the signal strength value and the synchronization word normalization correlation value are obtained by detecting the acknowledgement packet sent by the CSB slave device. Only when the signal strength value and the normalized correlation value of the synchronous word are larger than the preset respective threshold values, the retransmission request sent by a certain CSB slave device is determined to be received, the subsequent retransmission process is carried out, and otherwise, the data transmission in the current transmission interval is directly ended. In addition, when the number of times of retransmitting the broadcast data to the CSB slave device is equal to the preset number of retransmissions, the retransmission of the broadcast data to the CSB slave device is stopped.
Example 5
As shown in fig. 8, this embodiment proposes a wireless communication system, which includes a bluetooth master device and at least one bluetooth slave device, where the bluetooth master device is a CSB master device, and the bluetooth slave device is a CSB slave device. The specific structure and working principle of the bluetooth master device and the bluetooth slave device may be described with reference to embodiment 3 and embodiment 4, and will not be described herein.
The wireless communication system of the embodiment realizes automatic retransmission by adding the feedback mechanism of the CSB slave device on the basis of the existing Bluetooth CSB, thereby improving the reliability of Bluetooth point-to-point broadcast data. Specifically, when the CSB slave device is not correctly receiving the CSB data, the CSB slave device transmits a time slot to confirm that the packet feedback is incorrectly received. The CSB master device is added to receive the confirmation packet fed back by the CSB slave device in the time slot detection mode of the CSB master device, and whether to retransmit the CSB data is judged by detecting the confirmation packet. And in the CSB interval, a plurality of retransmission time slots of the CSB are added, so that the CSB data can be retransmitted conveniently when the CSB slave equipment cannot correctly receive the CSB data, and the broadcasting reliability is improved.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (12)
1. A method of data retransmission, the method comprising:
receiving broadcast data sent by a Bluetooth master device at a preset receiving interval;
detecting whether broadcast data sent by the Bluetooth main equipment is correctly received, and determining that the broadcast data sent by the Bluetooth main equipment is not correctly received when the synchronous words of the broadcast data are not matched, the packet head is received in error or the cyclic redundancy detection is not passed;
when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, all Bluetooth slave devices which do not receive the broadcast data sent by the Bluetooth master device almost synchronously send the same acknowledgement packet in a sending time slot, the Bluetooth master device is requested to retransmit the broadcast data and receive the retransmitted broadcast data, the acknowledgement packet comprises a synchronous word or an access address, and the synchronous word or the access address in the acknowledgement packet is the same as the synchronous word or the access address of the broadcast data sent by the Bluetooth master device;
and when the correct reception of the broadcast data sent by the Bluetooth master device is detected, ending the data reception in the current receiving interval.
2. The method of claim 1, wherein the specific process of receiving the retransmitted broadcast data comprises:
receiving broadcast data retransmitted by the Bluetooth master device in a receiving time slot;
the acknowledgement packet is a signal generated by requesting the bluetooth master to retransmit the broadcast data when the broadcast data transmitted by the bluetooth master is not correctly received.
3. The method of claim 1, wherein prior to requesting the bluetooth master device to retransmit broadcast data and receiving the retransmitted broadcast data, the method further comprises:
judging whether the number of times of receiving broadcast data retransmitted by the Bluetooth main equipment reaches the preset retransmission number of times or not;
and stopping requesting the Bluetooth master device to retransmit the broadcast data when the number of times of receiving the broadcast data retransmitted by the Bluetooth master device reaches the preset retransmission number.
4. The method of claim 1, wherein the specific process of detecting whether the broadcast data transmitted by the bluetooth master device is correctly received comprises:
and detecting the received broadcast data, and determining to correctly receive the broadcast data sent by the Bluetooth master device when the synchronous word of the broadcast data is matched, the packet head is correctly received and the cyclic redundancy detection is passed.
5. The method according to claim 4, wherein the method further comprises:
and when the detection result is that the broadcast data sent by the Bluetooth master equipment is correctly received, ending the receiving of the broadcast data sent by the Bluetooth master equipment in the current receiving interval.
6. The method according to any one of claims 1 to 5, further comprising:
the Bluetooth master device transmits broadcast data to the Bluetooth slave device in a transmission time slot at preset transmission intervals;
and when the Bluetooth master device receives the confirmation packet sent by the Bluetooth slave device, retransmitting broadcast data corresponding to the confirmation packet to the Bluetooth slave device.
7. A bluetooth slave device, wherein the bluetooth slave device comprises a data transceiver module and a processor;
the data receiving and transmitting module is used for receiving broadcast data sent by the Bluetooth main equipment at preset receiving intervals;
the processor is configured with processor-executable operating instructions to perform operations comprising:
detecting the received broadcast data, and determining that the broadcast data sent by the Bluetooth master device is not received correctly when the synchronous words of the broadcast data are not matched, the packet head is received in error or the cyclic redundancy detection is not passed;
when the fact that the broadcast data sent by the Bluetooth master device is not received correctly is detected, all Bluetooth slave devices which do not receive the broadcast data sent by the Bluetooth master device synchronously send the same acknowledgement packet in the same sending time slot, the Bluetooth master device is requested to retransmit the broadcast data and receive the retransmitted broadcast data, the acknowledgement packet comprises a synchronous word or an access address, and the synchronous word or the access address in the acknowledgement packet is the same as the synchronous word or the access address of the broadcast data sent by the Bluetooth master device;
and when the correct reception of the broadcast data sent by the Bluetooth master device is detected, ending the data reception in the current receiving interval.
8. The bluetooth slave device of claim 7, wherein the processor is configured with processor-executable operating instructions to perform operations comprising:
when the fact that the broadcast data sent by the Bluetooth master device are not received correctly is detected, a confirmation packet is sent to the Bluetooth master device in a sending time slot, and broadcast data retransmitted by the Bluetooth master device is received in a receiving time slot;
the acknowledgement packet is a signal generated by requesting the bluetooth master to retransmit the broadcast data when the broadcast data transmitted by the bluetooth master is not correctly received.
9. The bluetooth slave device of claim 7, wherein the processor is configured with processor-executable operating instructions to perform operations comprising:
before requesting the Bluetooth master device to retransmit the broadcast data and receiving the retransmitted broadcast data, judging whether the number of times of receiving the broadcast data retransmitted by the Bluetooth master device reaches the preset retransmission number;
and stopping requesting the Bluetooth master device to retransmit the broadcast data when the number of times of receiving the broadcast data retransmitted by the Bluetooth master device reaches the preset retransmission number.
10. The bluetooth slave device of claim 7, wherein the processor is configured with processor-executable operating instructions to perform operations comprising:
and detecting the received broadcast data, and determining to correctly receive the broadcast data sent by the Bluetooth master device when the synchronous word of the broadcast data is matched, the packet head is correctly received and the cyclic redundancy detection is passed.
11. The bluetooth slave device of claim 10, wherein the processor is configured with processor-executable operating instructions to perform operations comprising:
and when the detection result is that the broadcast data sent by the Bluetooth master equipment is correctly received, ending the receiving of the broadcast data sent by the Bluetooth master equipment in the current receiving interval.
12. A wireless communication system comprising a bluetooth master device and a bluetooth slave device according to any of claims 7 to 11;
the Bluetooth master device is used for sending broadcast data to the Bluetooth slave device in a sending time slot at preset sending intervals, and retransmitting the broadcast data corresponding to the acknowledgement packet to the Bluetooth slave device when receiving the acknowledgement packet sent by the Bluetooth slave device; the acknowledgement packet is a signal generated by the bluetooth slave device that does not correctly receive the transmitted broadcast data and requests retransmission of the broadcast data.
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| CN109587666B (en) * | 2018-11-22 | 2022-07-26 | 重庆物奇科技有限公司 | Bluetooth device, system and scheduling method |
| CN111385045B (en) * | 2018-12-29 | 2022-04-15 | 南京中感微电子有限公司 | Audio data communication system |
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